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. 2018 Jul 23;18(7):2387. doi: 10.3390/s18072387

Figure 6.

Figure 6

Colormap of weight value from the multiple SVM, Control versus all other groups (C-SVM), SS group versus all other groups (SS-SVM), and LS group versus all other groups (LS-SVM) for various HRV features. (A) The Multiple SVM included features determined by the C-SVM, SS-SVM, and LS-SVM. (B) Optimal features determined included the mean of R-R intervals (mRR), ln (LF/HF), and ln HF by the C-SVM; (C) the nLF, nHF, ln LF, and square root of the mean squared difference between adjacent R-R intervals (RMSSD) by the SS-SVM; and (D) the standard deviation of R-R intervals (SDRR), coefficient of variance of R-R intervals (CVRR), and mean of heart rates (mHR) by the LS-SVM. The results of the ranking process indicate the following descending order for the HRV features: CVRR, nLF, nHF, SDRR, mRR, ln (LF/HF), ln HF, mHR, ln LF, proportion of N-N intervals that differ by more than 5 ms (pNN5), and RMSSD.